La partie principale de cette recherche a été réalisée dans le cadre du projet européen FP7-Marie Curie « CHANGES: Changing Hydro-meteorological Risks as Analyzed by a New Génération of European Scientists » financé par la Commission Européenne (www.changes-itn.eu, 2011-2014, Grant No. 263953). The main part of this research was carried out within the Marie Curie Research and Training Network "CHANGES: Changing Hydro-meteorological Risks as Analyzed by a New Génération of European Scientists" fiinded by European Commission's 7th framework program (www.changes-itn.eu, 2011-2014, GrantNo. 263953).